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Fig. 15.

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Evolution of He I line velocities. Left panel: Temporal evolution of the velocities associated with the narrow He I line components, which trace the unshocked CSM. Right panel: Velocity evolution of the broader He I emission components, reflecting the dynamics of the shocked gas region. Data for comparison SNe Ibn are adopted from Pastorello et al. (2016) and Wang et al. (2024a).

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